Eraser and holding tip therefor



p 1933- H. B. VAN DORN ET A1, 4 1,

ERASER AND HOLDING TIP 'IjHEREFOR Filed Jun 18. 1952 FREDERICK A. /7/xATTORNEYS I Patented Sept. 19, 1933 Q UNITEDSTATES PATENT OFFICE ERASERAND HOLDING TIP THEREFOR Horace B. Van Dorn, Maplewood, N. J., andFrederick H. Mix, Brooklyn, N. Y., assignors to Joseph Dixon CrucibleCompany, Jersey City, N. J., a corporation of New Jersey ApplicationJune 18, 1932. Serial No. 617,924 2 Claims. (01. 120- 38) This inventionrelates to erasers intended for of the eraser taken at rig t angles a Ofattachment to pencils or pencil caps, and to a Fig. 3; Fig. 5 is asectional view on the line 5-5 holding means for securing the erasers tothe of Fig. 1, looking in the direction of the arrows; pencil or cap.Fig. 6 is a front view of a pencil cap, showing the 5 The object of theinvention is to provide a novel eraser held therein, and Fig. 7 is aview taken at 60 form of eraser intended for attachment to pencils rightangles to t at Of 6- or to pencil caps in which the desirable featuresIn t e Co struct on S ow i F t0 5 of the so-called circular or disceraser are elusive, 8 indicates a pencil of conventional form present.It is well known that an eraser of thin pr v d d at one of its ends witha tubular metal r fiat o t ur, provided ith urv d, sharp or ferrule orsocket 9 for the reception of the eraser knife edge about its periphery,is more suitable 10. The tubular ferrule or socket 9 is secured to forsome erasing purposes than the usual cylint p l y any f h m h dgenerally drical eraser mounted on the end of a pencil. p as forinstance, y Perforating the metal The flat type of eraser, presenting asharp or thin of the ferrule and forcing the displaced metal incurvededge, enables erasures to be made within Wardly t penetrate t Wooden Shat of the 70 a very small area, without marring or disturbing P adjacentor surrounding writing. The eraser 10 is of rubber and is formed with Inthe past, efforts have been made to attach a central cylindricalreinforcing portion 11 which erasers of the flat type to pencils orpencil caps, fits within the corrugated part 12 of the ferrule butwithout material success. The failure of 9 and is held thereby.Additional fastening such prior devices was due primarily to the shapesmeans for holding the eraser in the ferrule 9 may of the erasersemployed and to the manner in be employed, as by perforating the ferrule9 and which it was attempted to secure the erasers in forcing thedisplaced metal inwardly to penetrate position. In most cases thethickness of the the eraser, as indicated at 13. The cylindrical eraserused was such that the eraser did not portion 11 of the eraser has itsupper end formed possess the required stiffness to enable it to with aconical portion 14. Extending laterally satisfactorily perform itsintended erasing funcfrom the cylindrical part of the eraser is adisktion. In other cases, the means provided on the shaped or flatportion indicated at 15, this pencil for holding the eraser did not gripor part of the eraser being in the same plane as the hold the eraserwith sufficient force to resist the axis of the pencil to which it isattached. The strain imposed upon it during the erasing action opposingfaces16 and 17 of the portion 15 conso that the eraser became easilydislodged from verge from the cylindrical reinforcing portion 11 itsposition on the pencil or pencil cover. of the eraser to the peripheraledgeslg of the disc, This invention contemplates a structure in thisedge being relatively thin and sharp to enwhich these and other defectsof prior er'asers able erasing to be performed by it within a smallare'remedie'd and in which the form of eraser area. employed and themeans for attaching it in place The cylindrical reinforcing portion 11of the result in a very satisfactory.structure wherein all eraserextends below the disc-like portion 15 and of the advantages of the flator circular eraser enters into. the ferrule 9 wherein it is held as 9may be utilized. previously described. The opposite sides oftheSpecifically, the invention comprises an eraser ferrule 9 areformed-with V-s'naped slots 19 withbody of flat characteristics andpreferably of disc in which the lower edge portion of the disc 15 shape,provided with a curved, thin, sharp or fits and by which rotativemovement of the eraser r knife edge and formed witha' central conical inthe ferrule 9 is prevented. I or cylindrical reinforcement which iseither re- While the portion 15 of the eraser is herein movably receivedor securely fastened in the usual shown as being relatively disc-shaped,it will be tubular metal pencil ferrule or in a tubular pencilunderstood that the same need not necessarily be cap. formed in thisparticular shape since many other In the accompanying drawing, whereinsevforms may be used with satisfactory results, the eral embodiments ofthe invention are shown, Fig. primary requirement of the shape employedbe- 1 is a front elevation of a pencil provided with an ing that it besubstantially flat and thin to proeraser made in accordance with thisinvention; vide a-sharp and preferably curved erasing edge. Fig. 2 is aview at right angles to that of Fig. 1; These requirements are moresatisfactorily met Fig. 3 is a face view of the eraser as it appears byan eraser of disc shape although other forms when detached from thepencil; Fig. 4 is a view may be employed with success.

The central cylindrical reinforcement 11 conforming to and tightlyfitting the ferrule 9 securely holds the eraser in the ferrule and sinceits upper conical terminal 14 extends nearly to the peripheral edge 18,it is of sufficient size to add. body and strength to the eraser andacts as a reinforcement where the bending strain is imposed by the actof erasing.- This serves to prevent breakage of the eraser, which wasone of the primary defects of prior structures.

In Figs. 6 and 7, the eraser is shown attached to a pencil cover or cap20. This cap or cover is of conventional construction and is provided atone of its ends with the usual corrugated portion 21 into which thecylindrical part 21 of the eraser is received. In this construction theeraser may either be permanently fastened in the cap or may be removablyheld therein so that a new eraser may be substituted when that inposition becomes worn from use. The cap or cover member 20 is providedwith the V-shaped slots 22 fitting the disc portion of the eraser aspreviously described with reference to the construction of Figs. 1 to 5.

What we claim is:-

l. An eraser attachment for pencils comprising, a fiat rubber discprovided with an integral central conical reinforcement formed with alower cylindrical part, said reinforcement having its upper endextending relatively close to the periphery of the disc, a pencilferrule or cap into which the cylindrical part of the reinforcement isfitted, said ferrule having its wall slotted at diametrically oppositepoints to form the ferrule into jaws which embrace the opposite faces ofthe disc and prevent rotative movement of the eraser in the ferrule.

2. An eraser attachment for pencils comprising a disc-shaped section ofrubber provided with a central cylindrical reinforcement, the edges ofsaid disc-shaped section being substantially V- shaped in cross section,a pencil ferrule into which the reinforcement is fitted, the wall ofsaid ferrule being provided with V-shaped slots which divide the ferruleinto jaws embracing portions of the disc adjacent the centralreinforcement and preventing rotative movement of the eraser in theferrule.

HORACE B. VAN DORN. FREDERICK H. MIX.

